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Issue 5 - September 2006
Page 45 of 65
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Network005 - USR3& example of 1 Hz clockgeneration
Scan Rate 00030 ms
Label 01001 Enabled
7922
GLOBAL
ANALOGUE
FAULT
WorkingDis7922
00000
USR3
00000
R1212
+
R1981
=
R1212
R1212
/
00050
=
R1211
00000
>
R1211
>
00000
00000
MOVE
00001
R1211
6004
0.5 SECOND
CLOCK
WorkingDis6004
NOT
6005
1 Hz
CLOCK
WorkingDis6005
XOR
6005
1 Hz
CLOCK
WorkingDis6005
USR3 contains the Analogue Test and Event Processing Functions, Not Mandatory.
Discrete 7922 is set to logic zero to reset the analogue test logic in USR3, if used.
Not Mandatory - Discrete 6004 is a one scan clock that is true every 0.5 seconds with no accumulative
error, unless the scan time is set to greater than 0.5 seconds.
Discrete 6005 is a 1Hz clock with equal mark/space ratio. It can be used to flash lamps.
In these example networks the 1 Hz clock is used to pulse the Watchdog outputs. The Watchdog
outputs must be pulsed at minimum every 5 seconds and the logic for pulsing these outputs must be
in the last ladder network. This is Mandatory.